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Given that the 20th century is the century of genocide, it seems less than certain that the long term trend is "increasingly vitriolic".

The 20th century isn't the century of genocide; it's the century of media covered genocide.

This is true. It does seem, however, like that is the short-term trend of the last decade or three. Things don't have to be as bad as the mid 20th century to be worrying.

We always have nukes

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